html {
  /* 解决滑动报错 */
  touch-action: none;
  height: 100%;
  overflow: hidden;
}

body {
  height: 100%;
}

* {
  touch-action: pan-y;
}

h1 {
  font-size: 24px;
  text-align: center;
}

#result {
  color: red;
}

#btn {
  margin: 20px 0px;
}

#startTime,
#endTime {
  width: 100%;
  height: 100%;
  border: none;
  font-size: 17px;
  font-family: monospace;
}